A5045960622- Plant Molecular Biology Research
- Plant Reproductive Biology
- Plant nutrient uptake and metabolism
- Legume Nitrogen Fixing Symbiosis
- Plant Gene Expression Analysis
- Plant Parasitism and Resistance
- Mycorrhizal Fungi and Plant Interactions
- Plant and animal studies
- Light effects on plants
- Photosynthetic Processes and Mechanisms
- Plant Stress Responses and Tolerance
- Advanced Data Storage Technologies
- Agronomic Practices and Intercropping Systems
- Insect-Plant Interactions and Control
- Bioenergy crop production and management
- Plant Taxonomy and Phylogenetics
- Polysaccharides and Plant Cell Walls
- Fungal Biology and Applications
Max Planck Institute for Plant Breeding Research
2019-2024
University of Cologne
2019-2024
Cluster of Excellence on Plant Sciences
2019-2022
Zero to Three
2022
Institut de Recherche pour le Développement
2011-2018
Université de Montpellier
2018
Centre de Coopération Internationale en Recherche Agronomique pour le Développement
2018
Laboratoire des Symbioses Tropicales et Méditerranéennes
2018
Université de Lorraine
2014-2017
Interactions Arbres-Microorganismes
2012-2017
Significance Plants use the hormone jasmonic acid (JA) to modulate plant:microbe interactions. Disease-causing microbes proteins alter host JA signaling aid their growth in plant tissues. Beneficial symbiotic fungi, which colonize tissues and provide essential ecosystem services such as carbon sequestration fertilization, can also cells promote colonization. Here, we demonstrate that MiSSP7 (Mycorrhiza-induced small secreted protein-7) protein of beneficial fungus Laccaria bicolor interacts...
In plants, root nitrate uptake systems are under systemic feedback repression by the N satiety of whole organism, thus adjusting acquisition capacity to demand for growth; however, underlying molecular mechanisms largely unknown. We previously isolated Arabidopsis high nitrogen-insensitive 9-1 ( hni9-1 ) mutant, impaired in transporter NRT2.1 supply. Here, we show that HNI9 encodes INTERACT WITH SPT6 (AtIWS1), an evolutionary conserved component RNA polymerase II complex. HNI9/AtIWS1 acts...
MicroRNAs (miRNAs) play important roles in regulating flowering and reproduction of angiosperms. Mature miRNAs are encoded by multiple MIRNA genes that can differ their spatiotemporal activities contributions to gene regulatory networks, but the functions individual poorly defined. We functionally analyzed activity all 5 Arabidopsis thaliana MIR172 genes, which encode miR172 promote floral transition inhibiting accumulation APETALA2 (AP2) APETALA2-LIKE (AP2-LIKE) transcription factors (TFs)....
Root systems of host trees are known to establish ectomycorrhizae (ECM) interactions with rhizospheric fungi. This mutualistic association leads dramatic developmental modifications in root architecture, the formation numerous short and swollen lateral roots ensheathed by a fungal mantle. Knowing that auxin plays crucial role development, we investigated how metabolism, signaling, response affected poplar (Populus spp.)-Laccaria bicolor ECM roots. The plant-fungus interaction arrest growth...
How specificity is conferred within gene regulatory networks an important problem in biology. The basic helix-loop-helix PHYTOCHROME-INTERACTING FACTORs (PIFs) and single zinc-finger CYCLING DOF (CDFs) mediate growth responses of Arabidopsis to light temperature. We show that these two classes transcription factor (TF) act cooperatively. CDF2 PIF4 are temporally spatially co-expressed, they interact form a protein complex the same genetic pathway promote hypocotyl cell elongation....
Summary The APETALA2 (AP2) transcription factor regulates flower development, floral transition and shoot apical meristem (SAM) maintenance in Arabidopsis. AP2 is also regulated at the post‐transcriptional level by microRNA172 (miR172), but contribution of this to SAM poorly understood. We generated transgenic plants carrying a form that resistant miR172 ( rAP2 ) or wild‐type susceptible miR172. Phenotypic genetic analyses were performed on these lines mir172 mutants study role regulation...
Abstract Plants flower in response to environmental signals. These signals change the shape and developmental identity of shoot apical meristem (SAM), causing it form flowers inflorescences. We show that increases SAM width height during floral transition correlate with changes size central zone (CZ), defined by CLAVATA3 expression, involve a transient increase organizing center (OC), WUSCHEL expression. The APETALA2 (AP2) transcription factor is required for rapid width, maintaining OC...
Floral transition, the onset of plant reproduction, involves changes in shape and identity shoot apical meristem (SAM). The change shape, termed doming, occurs early during floral transition when it is induced by environmental cues such as day-length, but how regulated at cellular level unknown. We defined morphological features SAM Arabidopsis thaliana . Both cell number size increased these were partially controlled gene regulatory network (GRN) that triggers flowering. Furthermore,...
Summary Perennials have a complex shoot architecture with axillary meristems organized in zones of differential bud activity and fate. This includes buds maintained dormant for multiple seasons used as reservoirs potential growth case damage. The Arabis alpina , perennial relative Arabidopsis thaliana consists zone placed between subapical vegetative basal flowering branches. is shaped after exposure to prolonged cold, required flowering. To understand how vernalization ensures the...
Among infection mechanisms leading to root nodule symbiosis, the intercellular pathway is probably most ancestral but also one of least characterized. Intercellular has been described in Discaria trinervis, an actinorhizal plant belonging Rosales order. To decipher molecular underlying with Frankia bacteria, we set up efficient genetic transformation protocol for D. trinervis based on Agrobacterium rhizogenes. We showed that composite plants transgenic roots expressing green fluorescent...
Arabis alpina is a polycarpic perennial, in which PERPETUAL FLOWERING1 (PEP1) regulates flowering and perennial traits vernalization-dependent manner. Mutagenesis screens of the pep1 mutant established role other time regulators PEP1-parallel pathways. Here we characterized three allelic enhancers (eop002, 085 091) flower early. We mapped causal mutations complemented mutants with identified gene. Using quantitative reverse transcriptase PCR reporter lines, determined protein spatiotemporal...
Summary Nitrogen‐fixing filamentous Frankia colonize the root tissues of its actinorhizal host Discaria trinervis via an exclusively intercellular pathway. Here we present studies aimed at uncovering mechanisms associated with this little‐researched mode entry, and in particular extent to which plant is active partner during process. Detailed characterization expression patterns infection‐associated genes has provided valuable tools identify infection sites, thus allowing vivo confocal...
In recent years, mycorrhizal research has undergone rapid expansion. Breakthroughs in genomics and other modern techniques have allowed us to break new ground multiple domains, such as evolution, physiology, function, community patterns biogeography of fungi. The International Conference on Mycorrhiza (ICOM) is the most important platform for scientists present discuss their work both theoretical applied areas symbiosis. ICOM 7 was held New Delhi (India), January 6–11, 2013, attracted over...
Background Nitrogen is a major limiting factor of plant growth in many ecosystems. Root nodule symbiosis (RNS) one the most efficient adaptations allowing plants to cope with nitrogen deficiency by establishing symbiotic association diazotrophic bacteria able produce ammonium from atmospheric nitrogen. Nevertheless RNS restricted two groups plants: legumes and Parasponia (Celtidaceae), that interact group gram-negative proteobacteria collectively called rhizobia, actinorhizal plants, 220...
Arctic alpine species experience extended periods of cold and unpredictable conditions during flowering. Thus, often, plants use both sexual asexual means reproduction to maximize fitness ensure reproductive success. We used the arctic perennial
Abstract Plants flower in response to environmental signals. These signals change the shape and developmental identity of shoot apical meristem (SAM), causing it form flowers inflorescences rather than leaves. How changes SAM are coordinated is poorly understood. Using genetics, confocal microscopy RNA sequencing, we show that reciprocal repression APETALA2 (AP2) SUPPRESSOR OF OVEREXPRESSION CONSTANS 1 (SOC1) transcription factors crucial coupling these processes. During vegetative...
ABSTRACT Arabis alpina , similar to woody perennials, has a complex architecture with zone of axillary vegetative branches and dormant buds that serve as perennating organs. We show floral development during vernalization is the key for shaping bud by facilitating synchronized rapid growth after thereby causing an increase in auxin response transport endogenous indole-3-acetic acid (IAA) levels stem. Floral associated subapical nodes. Our transcriptome analysis indicated these are not but...
Arctic alpine species experience extended periods of cold and unpredictable conditions during flowering. Thus, often, plants use both sexual asexual means reproduction to maximise fitness ensure reproductive success. We used the arctic perennial Arabis alpina explore role prolonged exposure on adventitious rooting. exposed 4°C for different durations scored presence roots main stem axillary branches. Our physiological studies demonstrated that positively correlates with increased duration...